<template>
    <div class="sidebar">
        <el-menu class="sidebar-el-menu"
        :default-active="onRoutes"
        :collapse="collapse"
        background-color="#334256"
        text-color="#ffffff"
        active-text-color="#20a0ff"
        router
        >
            <template v-for="item in items">
                <template>
                 <el-menu-item :index="item.index" :key="item.index">
                   <i :class="item.icon"></i>
                   {{item.title}}
                 </el-menu-item>     
                </template>  
            </template>
        </el-menu>
    </div>
</template>
<script>
import bus from '../assets/js/bus';
export default {
    data() {
        return{
            collapse:false,
            items:[
                {
                    icon:'el-icon-document',
                    index:'Info',
                    title:'系统首页'
                },
                {
                    icon:'el-icon-document',
                    index:'Consumer',
                    title:'用户管理'
                },
                {
                    icon:'el-icon-document',
                    index:'Singer',
                    title:'歌手管理'
                },
                {
                    icon:'el-icon-document',
                    index:'SongList',
                    title:'歌单管理'
                },
            ]
        }
    },
    computed:{
        onRoutes(){
            return this.$route.path.replace('/','');
        }
    },
        created(){
        // 通过bus进行组件间的通信，折叠侧边栏
            bus.$on('collapse',msg =>{
            this.collapse =msg;
        })
    }
}
</script>

<style scoped>
.sidebar{
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    background-color: #334256;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar{
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse){
    width: 150px;
}
.sidebar >ul{
    height: 100%;
}
</style>

